Downdraft boiler-furnace.



No. 629,350. Patented July 25, I899.

F. GIBTANNER.

DOWNDRAFT BOILER FURNACE.

(Application M Jan. 13', 1899.) I {No Model.) 7 Sheena-Shoat I.

WlTNESSES: I Qq lNVENTOR:-

I BY ATTORNEY No. 629,350. Patented July 25, 1399.

- r. GIRTANNER.

DDWNDBAFT BOILER FURNACE 7 (Application filed J'an. 13, 1899.) 1

(lo Iode L) 7'$haats-Sh'e0t 2.

WITNESSES: INVENTORI BY A v ATTORNE Patented July 25,- I899.

No. 629,350. F GIBTANNEB DOWNDBAET BOILER FURNACE.

[Application filed 1m. 13, 1899 (Ila Model.) 7 Sheets-Shea! 3.

v INVENTOR 7 freamzo/L ATTORNEYC;

, Patented My 25,1899. F. GIRTANNER. DOWNDRAFT BOILER FURNACE.

(Application filed Jun. 13, 1899.)

' (No Model.) 7 Shear-Sheet 4.

- v \NVENTORI" I ATTCRNEY ms mums virus co, Pam-ammo. WASHINGZ'QM D c No. 629,350. Patented July 25, I899. F. GIRTANNER.

DOWNDRAFT BOILER FURNACE.

- (Application filed Ian. 13, 1899.) (No Model.) 7 Sheets-Sheet 5.

WITNESSES: iNVENTOR M/ awe. a

BY ,4 fl

ATTORNEY TH: NDRRXS PETERS cu. PNOYOL1THO.,WASH1NGTDN. v.1:

Patented My 25, I899.

RNACE.

7 Sheets-Sheet 6.

' F. GIRTAN DOWNDRAFT B E (Application file (Io lodcl.)

40/ ATTORNEY Nq. 629,350. Patented kuly 25, I899.

F. GIBTAN'NER. DOWNDRAFT BOILER FURNACE.

(Application filed Jan. 13, 1899.) (No Model.) 7 Sfieets$heet 7.

WITNESSES! INVENTOR jfeoxuaued ATTDRINEYV a m: Nunms mas coy. PHOTOim. wnsnmmav'n. c.

' UNITED STAT S,

PATENT OFFICE.

' FREDERICK GIRTANNER, or New. YORK, ,N. Y., ASSIGNOR T0 WILLIAM DE L. WALBRIDGE AND EDWARD J. BERWIND, rnos'rnns, or SAME PLACE; V

DOWN DRAFT BOILER-FURNACE.

srncnrzcn'rrolv formingpart of Letters Patent No. 629,350, dated July 25, 1899.

Application filed anuary 13,1899. seen No.-702,l)21. (No model) 5 county of New York, and State of New York,

have. invented certain new and useful Improvements in Downdraft Boiler-Furnaces, of which the following is a specification.

My invention-has reference to improvements in steam boiier furnaces, and particularly to downdraft-;furnaces-that is to say, those in which theair necessary for the combustionof the-fuel or the maintenance of the fire is conducted to the fuel from'above' and the products of. comb stion are carried away from below."

The object of mypreseut inventioniis-to produce a more thorough combustion and a higher heat than has been obtainable with suits I accomplish by'a peculiard'istribution or arrangement of the air-supply orifices or tubes relative to the furnace and to the charging-openings thereof. V g

My invention consists, therefore, in the combination, with the supportinggrate for the fuel, of a'series of air-supplytubes or'orifices arranged at the top of the'furnace and contiguous with thefrontand side walls of the same anda series of air tubes or orifices arranged intermediate of the tubes at the side wallsand preferablyadjacent to the charg; ving-ope'anings. 1 i r My invention: also embodies other novel features of construction used-inconnection with those just set forth,as fully pointed out p in the following specification and claims and illustrated in the annexed drawings, in'

which=- r H Figure; 1'. represents a front elevation of a boiler and furnace embodying my invention, part of the samebeing broken away. Fig. 2 is a side elevation of the same. Fig. 3 is a sectional plan. the line 4: 4:,'Fig. '6;

Fig. 5 is a sectional plan with the covers of the air-orifices and the coal openings removed. Fig. 6 is a vertical section on the line 6 6, Fig. 4. Fig. 7 is asection r on the line 7 7, Fig. 4.; Fig. 8 is a vertical seetion of a modified form. 1 1

: y a rocking the furnaces hitherto proposed. These re Fig. 4 is a'vertical section on} Similar letters and numerals of reference designate corresponding parts throughout the several views of the drawings.

Referring. to the drawings, the letter A designates the furnace, which is built sub stantially rectangular in cross-section, with front and rear walls 1 and 2 and with side walls 3,-said furnace being located substantially in front of the head of the boiler- B.

The grate 4 may be of any construction commonly used in boiler-furnaces; but prefergrate provided with mechanism 5 for actuating the several grate-bars is employed The air necessary for effecting the combustionof fuel (generally bituminous coal) is introduced. into the furnace from above through tubes (1, which are so arranged as tofeffect the distribution of the air-supply in jets at the most favorable points for producing a uniform and complete combustion and to'prevent clinkering at the walls of the furnaceand alsoftoprevent caking in the mass of the fuel.- To insure a proper downward feed of the fuel while-being consumed,

the rear Wallfis outwardly and, downwardly inclined.

Referring now particularly-to Figs. 5, .6,

and7 of the drawings, the letters b designate the charging openings for fuel, which are arranged at the top of the furnace and in the. longitudinal direction of the same-that is,

transversely to the'boilerand are preferably placed equidistant apart. The air-tubes a are arranged contiguous tov the front and side walls of the furnace Aand on three sides of the charging openings. These tubes, may

open directly to the atmosphere but in practice I prefer to conduct the air necessary for combustion'through a suitable fine or fines 6, located exterior to the front wall 1 of the .tion pass fromnear the bottom of the furnace through a passage or passages '8 into the usual combustion-chamber 9, and in the present example, where I have shown a return tubu- 9 furnace and communicatingl'at'their upper. ends with a horizontal chamber or chambers lar boiler, the gases after passing through the boiler-tubes are conducted upwardly to the chimney through the uptake 10 and suitable fines. (Not shown.) The quantity of air supplied to the tubes to is regulated by means of suitable gates 11, located at the air-inlets 12 to the fines 6. The fuel is introduced into the furnace through the charging-openings I), previously described, and the chimney draft induces currents of air to pass through the openings 12, flues 6, and chambers 7 and from the latter through the tubes a, which said tubes form streams or jets of air directed against the fuel contiguous with the front wall, with the side walls, and at points intermediate of all the walls; The action of each jet is to supply air against a particular point of the fuel, and in View thereof the combustion of fuel gradually rises vertically along the paths of the downward jets of air, with the result that vertical holes or openings are formed in the fuel along the lines of air-supply. The coal adjacent to such openings naturally moves laterally, and consequently the body of the fuel is being continually broken up or agitated and caking or packing is positively prevented. The tubes located adjacent to the sides of the charging-open-- ings and which I have designated by the reference-letters a serve to break up the fuel between the end walls of the furnace. The number of such tubes can be increased or decreased by increasing or decreasing the numberof the charging-openings. The charging-openings b are closed by suitable doors 0, which are preferably hinged, and the portions of the chambers '7 above the tubes at and a are closed by removable plates d, so that air can be fed directly to the tubes from above without passing through the flues 6. The plates d, laterally adjacent to the charging-openings Z), may be provided with side flanges e to form a hopper orguide for the fuel when it is delivered to said chargingopenings. Near the lower end of the furnace and at the front of the same is formed a series of openings f, closed by doors g, Which said openings are intended, essentially, for cleaning out the furnace. The doors g may be provided with openings, closed by adj ustable draft-slides h, for the purpose of admitting air through the openingsf, if desired.

The ash-pit door 2' is so fitted as to close the ash-pitj substantially against the ingress of air; but airmay be admitted through the ash pit door if circumstances so require.

An air-distributer Z, Figs. 6 and 7such, for instance, as a perforated clay or iron tubeis preferably arranged at the rear of the furnace-wall 2 and above the passages 8, through which the products of combustion enter the combustion-chamber, so as to introduce air in a divided condition into the flame emanating from said passages. The supply of air to the distributer may be regulated or entirely bodied in a furnace adapted for return tubular boilers, it is of course evident that the same furnace, with slight modifications, is

' adapted for use with other forms of boilerssuch, for instance, as water-tube boilers of various types,upright boilers, marine boilers, and the ordinary fire-flue boilers. It is also evident that the charging-openings may be located at the front of the furnace instead of at the top of the same.

In place of the grate 4 as a fuel-support a hearth 4* may be used, as shown in Fig. 8, said hearth being closed against ingress of air into the furnace from below. The ashes may be raked from the hearth through the doors or openings f.

What I claim as new is 1. In a downdraft boiler-furnace, the combination of a support for fuel, a series of airsupply tubes arranged at the top of the furnace and contiguous With the front and side walls of the same to direct jets of air downwardly through the fuel, and a series of airtubes arranged intermediate of the tubes at the side walls for the same purpose, substantially as described.

2. In a downdraft boiler-furnace, the combination of a support for fuel, a series of charging-openings for thefurnace, a series of air-tubes arranged adjacent to the front and side walls of the furnace to direct jets of air downwardly through the fuel, and a series of air-tubes arranged intermediate of the charging-openings for the same purpose, substantially as described.

3. In a downdraft boiler-furnace, the combination of a support for fuel, a series of charging-openings located at the top of the furnace, a series of air-tubes arranged at the top of the furnace adjacent to the front and side walls of the same to direct jets of air downwardly through the fuel, and a series of air-tubes arranged adjacent to. the chargingopenings for the same purpose, substantially as described.

4. In a downdraft boiler-furnace, the combination of a support for fuel, a series of charging-openings located at the top of the furnace, a series of air-tubes arranged adjacent to the front and side walls of the furnace, to direct jets of air downwardly through the fuel, a series of air-tubes arranged intermediate of the charging-openings for the same purpose, air fines and chambers arranged adjacent to the walls and top of the furnace, and means for regulating the supply of air to said fiues and chambers, substantially as described.

5. In a downdraft boiler-furnace, the combination of a support for fuel, a series of airsupply tubes arranged at the top of the furnace adjacent to the front and side Walls of IIO ' the same,

rect jets of air downwardly through the fuel, a series of air-tubes arranged intermediate of the air-tubes at the side walls for the same purpose, an air chamber or chambers above the lines of tubeswith which chambers said tubes communicate, and removable plates forming part of the in losure of said air chamber or chambers, substantially as described. 6. In a downdraft boiler-furnace, the combination of a support for fuel, a series of charging-openings located at the top of the furnace, a series of air-tubes arranged adjacent to the front and side walls of the furnace to direct jets of air downwardly through the fuel, a series of air-tubes arranged intermediate of the charging-openings for the same purpose, an air chamber or chambers with which said tubes communicate, and removable plates forming part of the inclosure of said chamber or chambers and provided with upwardly-extending flanges adjacent to the chargin g-openin gs,substanti ally as described.

7. In a downdraft boiler-furnace, the combination of a support for fuel, a series of charging-openings for the furnace, a series of air-tubes arranged adjacent to the front and side walls of the furnace to direct jets of air downwardly through the fuel, a series of airtubes arranged intermediate of the chargingopenings for the same purpose, an opening or. openings provided with doors and regulators, and a passage or passages 8 leading through the rear wall of the furnace to the combustion-chamber and located at or near the bottom of the furnace, substantially as described.

8. In a downdraft boiler-furnace, the com bination of a support for fuel, a series of airsupply tubes arranged at the top of the furnace and contiguous with the front and side walls of the same to direct jets of airdownwardly through the fuel, a series of air-tubes arranged intermediate of the tubes at the side walls for the same purpose, a passage or passages through the rear wall of the furnace communicating with the combustion chamand said tubesbeing adapted to di-.

her and located near the bottomof the fur nace, and an air-distributor located back of the furnace-wall, substantially as described.

9. In a downdraft boiler-furnace, the combination of a support for fuel, a series of airsupply tubes arranged at the top of the furnace and contiguous with the front and side walls of the same to direct jets of air downwardly through the fuel, a series of air-tubes arranged intermediate of the tubes at the side walls for the same purpose, rality of contracted passages 8 located near thebottom of the furnace and passing through the rear wall of the same to communicate with the combustion-chamber, substantially as described. V

10. In a downdraft boiler-furnace, the combination of a support for fuel, a series of air tubes arranged at the top of the furnace contiguous with the front and side walls of the same to direct jets of air downwardly through the fuel, a series of air-tubes arranged intermediate of the tubes at the sidewalls for the same purpose, a rear wall 2 for the furnace having a downwardly and outwardly inclined inner wall, and a passage or passages through the rear wall of the furnace communicating with the combustion-chamber and located.

near the bottom of the furnace, substantially as described. 11. In a downdraft boiler-furnace, the combination of a hearth closing ed the ingress of air to the furnace from below, a series of air-.

supply tubes arranged at the top of the furnace and contiguous with the front and side walls of the. same to direct jets of air downwardly through the fuel, and a series of airtubes arrangedntermediate of the tubes at the side walls for the same purpose, substantially as described.

In testimony whereof I have hereunto set my hand in the presence of two-subscribing witnesses.

' FREDERICK GIRTANNER.

Witnesses:

EUGENIE P. HENDRICKSON, ALFRED J. EISENBRAUN;

and a pin-- 

